24 
SMITHSONIAN INSTITUTION 
plate. There are a few openings for free interbrachial pinnules, apparently 
only one to each arm on the outer side of the ray, lying close under the arm- 
base. These structures were not brought out in the original description, and 
whereas the number of IBB is there said to be three, it is distinctly five in my 
specimen. Miller and Gurley treated the genus as belonging to the Flexibilia. 
Horizon and locality. Laurel limestone, Niagaran ; St. Paul, Indiana. 
Rhodocrinidae genus and species indet. 
Plate 4, figs. 8, 8 a 
A fragment with only part of the base, attached in a slanting position to a very large 
stem. There are 4 IBB at the bottom of an indented cavity as in several of the associated 
forms, and entirely covered by the stem. None of the others of this family here described 
have any part of the stem preserved, and it may be that, large as it seems, this is the normal 
type for the group. But the sloping attachment to the calyx is unusual. The BB are truncate 
for a connection with the succeeding iBr, separating the RR, so it probably belongs here. 
Horizon and locality. Laurel limestone, Niagaran ; St. Paul, Indiana. 
Lyriocrinus melissa Hall 
Lyriocrinus melissa, Hall, 28th Rep. New York St. Mus. Nat. Hist., 1879, p. 139, pi. 15, figs. 18-27; nth 
Ann. Rep. Indiana Dep. GeoL, 1882, p. 269, pi. 14, figs. 18-27, pi. 15, fig. ii. — Wachsmuth and Springer, 
N. A. Crin. Cam., 1897, p. 263, pi. ii, figs. 4a-/. — -For complete synonymy, Bassler, Bibliogr. Index, 
Bull. 92, U. S. Nat. Mus., 1915, p. 774; also for the genus, and other species, p. 773. 
This very typical Rhodocrinid species is one of the leading fossils in the Waldron for- 
mation, occurring abundantly at the type locality, Waldron, Indiana, and in the rich exposure 
of Waldron shale at Newsom, near Nashville, Tennessee; it has also been identified in the 
Racine dolomite of the Chicago area. Reference to the thorough discussion and illustration 
of the species by Hall and by Wachsmuth and Springer will afford all needful information, 
and it is accordingly omitted from consideration here. 
Another fine species, L. dactylns, was described by Hall from the Rochester shale at 
Lockport, of which unusually perfect specimens from Grimsby, Ontario, are in the Sir Ed- 
mund Walker collection in the University of Toronto-. I have an undescribed specimen from 
Dudley, indicating the presence of the genus in the English Silurian. 
